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Modifying a DEM

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01-30-2022 07:30 PM
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New Contributor

Hi everyone! I'm new in using ArcGIS and I just want to know if there's a way for me to modify a DEM, like for example, I want to make a defined river deeper as if I'm dredging it. Is that possible and how? Thank you so much.

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MVP Esteemed Contributor

"stream burning"  lots of links on this.

ArcHydro has conditioning tools, but for a quick solution,

Take your river (polyline or polygon I presume).

convert it to raster with the exact same cell size, extent, snap raster as your dem.

assign where the river is a value equal to the depth you want to dredge (eg 1 meter, etc)

assign the non-river areas a value of 0.

take your dem and subtract the above ( eg Minus (Spatial Analyst)—ArcGIS Pro | Documentation or other approaches)

you now have a dem with a river whose is deeper.

I have assumed in the above that you dem extends under the river surface with elevation values...!

If not, then the process will be totally different

... sort of retired...
2 Replies
MVP Esteemed Contributor

"stream burning"  lots of links on this.

ArcHydro has conditioning tools, but for a quick solution,

Take your river (polyline or polygon I presume).

convert it to raster with the exact same cell size, extent, snap raster as your dem.

assign where the river is a value equal to the depth you want to dredge (eg 1 meter, etc)

assign the non-river areas a value of 0.

take your dem and subtract the above ( eg Minus (Spatial Analyst)—ArcGIS Pro | Documentation or other approaches)

you now have a dem with a river whose is deeper.

I have assumed in the above that you dem extends under the river surface with elevation values...!

If not, then the process will be totally different

... sort of retired...
by
New Contributor

Thank you so much, sir! Your response clarified a lot of things for me.